But Six did say that she wanted a baby, right? I wonder if they could have taken a sample of DNA from Gaius and created a test-tube hybrid, in which case the vision of the baby (if that's what they were looking at) could actually be Baltar's and Six's.

The question of Galactica Boomer's actions is a good one. I can perfectly understand why. The whole place is in chaos and they can get rid of one human leader, now that Baltar is positioned to take over civilian lead. I think Tigh would be easier to manage than Adama.

Or it could be that the Cylons think that Boomer outlived her usefulness, so they might as well make good use of her before she gets exposed as a Cylon.